SOURCES JJN

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http://library.thinkquest.org/12255/library/dynasty/tang.html

http://www.hyperhistory.net/apwh/essays/cot/t3w9tangp1hj.htm

http://www.chinavoc.com/history/tang/recollection.htm

http://polaris.gseis.ucla.edu/yanglu/ECC_HISTORY_TANG%20DYNASTY.htm